<template>
  <form-item-wrapper :designer="designer" :field="field" :rules="rules" :design-state="designState"
                     :parent-widget="parentWidget" :parent-list="parentList" :index-of-parent-list="indexOfParentList"
                     :sub-form-row-index="subFormRowIndex" :sub-form-col-index="subFormColIndex" :sub-form-row-id="subFormRowId">
    <div class="full-width-input" :class="{'readonly-mode-cascader' : isReadMode}">
      <el-cascader ref="fieldEditor" :options="cascaderOptions" v-model="fieldModel"
                   :disabled="field.options.readonly || isReadMode || field.options.disabled || field.options?.isAllowEditSelectorField == '2'"
                   :clearable="field.options.clearable"
                   :filterable="field.options.filterable"
                   :placeholder="field.options.placeholder || i18nt('render.hint.selectPlaceholder')"
                   :show-all-levels="showFullPath"
                   :props="{ checkStrictly: field.options.checkStrictly, multiple: field.options.multiple, expandTrigger: 'hover', value: valueKey, label: labelKey, children: childrenKey }"
                   @visible-change="hideDropDownOnClick" @expand-change="hideDropDownOnClick"
                   @focus="handleFocusCustomEvent" @blur="handleBlurCustomEvent"
                   @change="onFieldChangeEvent">
      </el-cascader>
      <template v-if="isReadMode">
        <span class="readonly-mode-field">{{getContentForReadMode()}}</span>
      </template>
    </div>
  </form-item-wrapper>
</template>

<script>
  import FormItemWrapper from './form-item-wrapper'
  import emitter from '@/utils/emitter'
  import i18n, {translate} from "@/utils/i18n";
  import fieldMixin from "@/components/form-designer/form-widget/field-widget/fieldMixin";
  // import {
  //   pcTextArr,
  //   pcaTextArr,
  // } from "element-china-area-data";

  export default {
    name: "cascader-widget",
    componentName: 'FieldWidget',  //必须固定为FieldWidget，用于接收父级组件的broadcast事件
    mixins: [emitter, fieldMixin, i18n],
    props: {
      field: Object,
      parentWidget: Object,
      parentList: Array,
      indexOfParentList: Number,
      designer: Object,

      designState: {
        type: Boolean,
        default: false
      },

      subFormRowIndex: { /* 子表单组件行索引，从0开始计数 */
        type: Number,
        default: -1
      },
      subFormColIndex: { /* 子表单组件列索引，从0开始计数 */
        type: Number,
        default: -1
      },
      subFormRowId: { /* 子表单组件行Id，唯一id且不可变 */
        type: String,
        default: ''
      },

    },
    components: {
      FormItemWrapper,
    },
    data() {
      return {
        oldFieldValue: null, //field组件change之前的值
        fieldModel: null,
        rules: [],
      }
    },
    computed: {
      labelKey() {
        return this.field.options.labelKey || 'label'
      },

      valueKey() {
        return this.field.options.valueKey || 'value'
      },

      childrenKey() {
        return this.field.options.childrenKey || 'children'
      },

      showFullPath() {
        return (this.field.options.showAllLevels === undefined) || !!this.field.options.showAllLevels
      },

      /* 计算属性会被缓存，已弃用，改用getContentForReadMode方法！！ */
      // contentForReadMode() {
      //   let onlyLeafFlag = !this.field.options.checkStrictly
      //   let checkedNodes = this.$refs.fieldEditor.getCheckedNodes(onlyLeafFlag)
      //   if (!checkedNodes || (checkedNodes.length <= 0)) {
      //     return '--'
      //   } else {
      //     return checkedNodes.map(nodeItem => nodeItem.text).join(", ")
      //   }
      // },

      cascaderOptions() {
        // 此注释如有影响 可以放开
        // if (this.field.options.areaDataEnabled && (this.field.options.areaDataType === 1)) {
        //   console.log(window.elementChinaAreaData)
        //   return window.elementChinaAreaData.pcTextArr
        // } else if (this.field.options.areaDataEnabled && (this.field.options.areaDataType === 2)) {
        //   return window.elementChinaAreaData.pcaTextArr
        // }

        return this.field.options.optionItems
      }

    },

    beforeCreate() {
      /* 这里不能访问方法和属性！！ */
    },

    created() {
      /* 注意：子组件mounted在父组件created之后、父组件mounted之前触发，故子组件mounted需要用到的prop
        需要在父组件created中初始化！！ */
      this.registerToRefList()

      if (this.field.options.areaDataEnabled && (this.field.options.areaDataType === 1)) {
        if (!this.designState) {
          this.field.options.optionItems = pcTextArr
        }
        this.initFieldModel()
      } else if (this.field.options.areaDataEnabled && (this.field.options.areaDataType === 2)) {
        if (!this.designState) {
          this.field.options.optionItems = pcaTextArr
        }
        this.initFieldModel()
      } else {
        this.initOptionItems(false, this.initFieldModel)
      }

      //this.initFieldModel()  /* 加了"绑定数据源后允许默认选中第一个选项作为默认值"以后，本行代码会冲突，故注释 */
      this.initEventHandler()
      this.buildFieldRules()

      this.handleOnCreated()
    },

    mounted() {
      this.handleOnMounted()
    },

    beforeUnmount() {
      this.unregisterFromRefList()
    },

    methods: {
      /* 开启任意级节点可选后，点击radio隐藏下拉框 */
      hideDropDownOnClick() {
        setTimeout(() => {
          document.querySelectorAll(".el-cascader-panel .el-radio").forEach((el) => {
            el.onclick = () => {
              this.$refs.fieldEditor.popperVisible = false // 单选框部分点击隐藏下拉框
            }
          })
        }, 100)
      },      
      getContentForReadMode() {
        if (this.field.options.areaDataEnabled && this.fieldModel && this.fieldModel.length > 0) {
          return this.fieldModel.join("/")
        }

        let checkedNodes = []
        if (this.$refs.fieldEditor) {
          checkedNodes = this.$refs.fieldEditor.getCheckedNodes(false)
        }

        if (!checkedNodes || (checkedNodes.length <= 0)) {
          return ''
        } else {
          return checkedNodes.map(node => node.text).filter(nodeText => nodeText).join(", ")
        }
      },

    }
  }
</script>

<style lang="scss" scoped>
  @import "../../../../styles/global.scss"; /* form-item-wrapper已引入，还需要重复引入吗？ */

  .full-width-input {
    width: 100% !important;

    :deep(.el-cascader) {
      width: 100% !important;
    }
  }

  .readonly-mode-cascader :deep(.el-cascader) {
    display: none;
  }

</style>
